#include <iostream>
#include <fstream>

using namespace std;

long long a,b;
void euclide(long long a,long long  b,int &x,int &y)
{
    if(b==0)
    {
        x=1,y=0;
    }
    else
    {
    int x0,y0;
    euclide(b,a%b,x0,y0);
    x=y0;
    y=x0-(a/b)*y0;
    }
}
int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
        f>>a>>b;
        int x,y;
        euclide(b,a,x,y);
        while(y<0)y+=a;
        g<<y;
    return 0;
}